Are you depressed and feel like crying, or is it just tears without the sad feelings?
You sound like you are under a lot of pressure, which could be causing the tears, and the crying is actually making things even worse, and stressing you out more.
Try to relax about your whole situation, and the crying in particular - the less you care about whether you cry or not the less stressed you will be and hopefully the less you will cry (I think thats something I learnt in psych last year, can't remember role of control anyone?) and do take a break - it will be better in the long run as when you come back to your work you will be better able to work.
I don't know what you do to de-stress, but last summer when I was on study leave and needed a break I would take the dog for a walk and it really helped to get the blood pumping, making me feel more alert, as well as clearing my head. Exercise gives you endorphins, so should help you feel better too. If you haven't got a dog and can't beg borrow or steal one - they are really good to talk to too, if you can't face talking to people at the mo - try to do some form of exercise, other methods of de-stressing like eating a lot of chocolate or having a long soak in the bath can lead to wallowing and make you feel a bit morose when you're down, so they might not be the best thing right now.